Double Electromagnetically Induced Transparency and Its Slow Light Application Based On a Guided-Mode Resonance...

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Electromagnetically induced transparency (EIT) and guided-mode resonance (GMR) are key phenomena in optics.
• Achieving multiple EIT-like effects simultaneously is challenging but desirable for advanced applications.

Purpose of the Study:

• To numerically demonstrate a double EIT-like effect in a waveguide grating structure (WGS).
• To theoretically explain the effect using a multi-level atomic system model.
• To explore the impact of GMR mode detuning on optical properties.

Main Methods:

• Numerical simulation of a three-layer silicon nitride WGS.
• Application of a multi-level atomic system model for theoretical analysis.
• Investigation of wavelength detuning effects on GMR modes.

Main Results:

• Successful numerical achievement of a double EIT-like effect.
• Obtained slow light delay times of 22.59 ps and 8.43 ps.
• Demonstrated a wide-band flat-top transparent window by tuning GMR modes.

Conclusions:

• The proposed WGS effectively generates a double EIT-like effect.
• The results highlight potential applications in low-loss slow optical devices, optical sensing, and optical communications.